Re: problem with pg_statistics

On Thu, 26 Jun 2003 10:08:05 -0400, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
wrote:
>Andre Schubert <andre(at)km3(dot)de> writes:
>> i think i need a little help with a problem with pg_statistic.
>
>Try reducing random_page_cost

With index scan cost being more than 25 * seq scan cost, I guess that
- all other things held equal - even random_page_cost = 1 wouldn't
help.

Andre might also want to experiment with effective_cache_size and with
ALTER TABLE ... SET STATISTICS.

Or there's something wrong with correlation?

Andre, what hardware is this running on? What are the values of
shared_buffers, random_page_cost, effective_cache_size, ... ? Could
you show us the result of

SELECT * FROM pg_stats
WHERE tablename = "tbl_traffic" AND attname = "time_stamp";

Servus
Manfred